/***********************************************************************
 * Copyright (c) 2004 Actuate Corporation.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 * Actuate Corporation - initial API and implementation
 ***********************************************************************/

package org.eclipse.birt.chart.factory;

import java.io.Serializable;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Locale;
import java.util.Map;

import org.eclipse.birt.chart.computation.IChartComputation;
import org.eclipse.birt.chart.computation.LabelLimiter;
import org.eclipse.birt.chart.computation.LegendItemRenderingHints;
import org.eclipse.birt.chart.computation.LegendLayoutHints;
import org.eclipse.birt.chart.computation.withaxes.SharedScaleContext;
import org.eclipse.birt.chart.device.IStructureDefinitionListener;
import org.eclipse.birt.chart.event.EventObjectCache;
import org.eclipse.birt.chart.event.StructureChangeEvent;
import org.eclipse.birt.chart.model.component.Label;
import org.eclipse.birt.chart.model.component.Series;
import org.eclipse.birt.chart.render.IActionRenderer;
import org.eclipse.birt.chart.script.IChartScriptContext;
import org.eclipse.birt.chart.script.IScriptClassLoader;
import org.eclipse.birt.chart.script.ScriptHandler;
import org.eclipse.birt.core.i18n.ResourceHandle;

import com.ibm.icu.util.ULocale;

/**
 * Encapsulates runtime information associated with each chart generation and
 * rendering session. It contains global objects that are defined per request.
 */
public final class RunTimeContext implements Serializable
{

	private static final long serialVersionUID = 1L;

	/**
	 * The locale associated with the runtime context.
	 */
	private ULocale lcl = null;

	/**
	 * A chart script context associated with a chart model.
	 */
	private IChartScriptContext csc = null;

	/**
	 * A script handler associated with a chart model.
	 */
	private transient ScriptHandler sh = null;

	/**
	 * A resource handle capable of retrieving externalized messages.
	 */
	private transient ResourceHandle rh = null;

	/**
	 * An interface reference used to lookup externalized messages.
	 */
	private transient IMessageLookup iml = null;

	/**
	 * A structure definition listener associated with this runtime context.
	 */
	private transient IStructureDefinitionListener isdl = null;

	/**
	 * An action renderer associated with this runtime context.
	 */
	private transient IActionRenderer iar = null;

	/**
	 * An script classLoader associated with this runtime context.
	 */
	private transient IScriptClassLoader iscl = null;

	/**
	 * A legend item layout hints asscociated with current context.
	 */
	private transient LegendLayoutHints lilh = null;

	/**
	 * A map holds all series renderers for current context.
	 */
	private transient Map<Series, LegendItemRenderingHints> seriesRenderers = null;

	/**
	 * A map to store user defined state object.
	 */
	private HashMap<Object, Object> stateStore = null;

	/**
	 * Specifies if enable scripting support in current context.
	 */
	private boolean enableScripting = true;

	/**
	 * Specifies if right-left mode is enabled.
	 */
	private int iRightToLeft = -1;
	//bidi_acgc added begin
	/**
	 * Specifies if the displayed text bidi reading order is Right To Left.
	 */
	private int iRightToLeftText = -1;
	//bidi_acgc added end
	/**
	 * Specified the shared context among multiple chart instances
	 */
	private transient SharedScaleContext sharedScale;

	/** 
     * The field indicates if current chart is sharing query with other module(table/crosstab...).
     * @since 2.3
     */
	private boolean isSharingQuery = false;
	
	
	private IResourceFinder resourceFinder = null;
	
	private IExternalizer externalizer = null;
	
	/**
	 * A default zero-arg public constructor used for object creation.
	 */
	public RunTimeContext( )
	{
		stateStore = new HashMap<Object, Object>( 2 );
	}

	/**
	 * Puts a state object to the store.
	 * 
	 * @param key
	 * @param state
	 */
	public void putState( Object key, Object state )
	{
		stateStore.put( key, state );
	}

	/**
	 * Returns the state object from store by the key.
	 * 
	 * @param key
	 * @return
	 */
	public Object getState( Object key )
	{
		return stateStore.get( key );
	}

	/**
	 * Removes the state object by the key.
	 * 
	 * @param key
	 * @return
	 */
	public Object removeState( Object key )
	{
		return stateStore.remove( key );
	}

	/**
	 * Clears all the stored states.
	 */
	public void clearState( )
	{
		IChartComputation cComp = getState( StateKey.CHART_COMPUTATION_KEY );

		if ( cComp != null )
		{
			cComp.dispose( );
		}

		for ( Iterator<Map.Entry<Object, Object>> iter = stateStore.entrySet( ).iterator( ); iter.hasNext( ); )
		{
			Map.Entry<Object, Object> entry = iter.next( );
			Object key = entry.getKey( );
			if ( key instanceof StateKey<?> )
			{
				if ( (( StateKey<?>) key ).needClear( ) )
				{
					iter.remove( );
				}
			}
			else
			{
				iter.remove( );
			}
		}
	}

	/**
	 * Returns if scriting is enabled in current context.
	 * 
	 * @return
	 */
	public boolean isScriptingEnabled( )
	{
		return enableScripting;
	}

	/**
	 * Sepcifies if to enable scripting in current context.
	 * 
	 * @param value
	 */
	public void setScriptingEnabled( boolean value )
	{
		enableScripting = value;
	}

	/**
	 * Returns the script classLoader if available.
	 * 
	 * @return
	 */
	public IScriptClassLoader getScriptClassLoader( )
	{
		return iscl;
	}

	/**
	 * Sets the script classLoader.
	 * 
	 * @param value
	 */
	public void setScriptClassLoader( IScriptClassLoader value )
	{
		iscl = value;
	}

	/**
	 * Internally sets an instance of the structure definition listener for
	 * device renderers that need a structure definition notification when
	 * rendering primitives.
	 * 
	 * @param isdl
	 *            The structure definition listener associated with the runtime
	 *            context.
	 */
	public void setStructureDefinitionListener(
			IStructureDefinitionListener isdl )
	{
		this.isdl = isdl;
	}

	/**
	 * Returns an instance of the structure definition listner for device
	 * renderers that need a structure definition notification when rendering
	 * primitives.
	 * 
	 * @return The structure definition listener associated with the runtime
	 *         context.
	 */
	public IStructureDefinitionListener getStructureDefinitionListener( )
	{
		return isdl;
	}

	/**
	 * Sets an IActionRenderer instance to current runtime context.
	 * 
	 * @param iar
	 */
	public void setActionRenderer( IActionRenderer iar )
	{
		this.iar = iar;
	}

	/**
	 * Returns the IActionRenderer of current runtime context.
	 * 
	 * @return
	 */
	public IActionRenderer getActionRenderer( )
	{
		return this.iar;
	}

	/**
	 * Sets the LegendItemLayoutHints for current context.
	 * 
	 * @param lilh
	 */
	public void setLegendLayoutHints( LegendLayoutHints lilh )
	{
		this.lilh = lilh;
	}

	/**
	 * Returns the LegendItemLayoutHints for current context.
	 * 
	 * @return
	 */
	public LegendLayoutHints getLegendLayoutHints( )
	{
		return lilh;
	}

	/**
	 * Sets the series renderers for current context.
	 * 
	 * @param msr
	 */
	public void setSeriesRenderers( Map<Series, LegendItemRenderingHints> msr )
	{
		this.seriesRenderers = msr;
	}

	/**
	 * Returns the series renderers for current context.
	 * 
	 * @return
	 */
	public Map<Series, LegendItemRenderingHints> getSeriesRenderers( )
	{
		return seriesRenderers;
	}

	/**
	 * Notifies the structure definition listener of a change in the current
	 * running structure that defines a group of primitives being rendered and
	 * puts them into context with reference to the source object.
	 * 
	 * @param sEventName
	 *            Defines the structure being defined along with the event type
	 * @param oSource
	 *            The source object on which the structure is being defined
	 * 
	 * @return 'true' if the structure definition listener exists and was
	 *         notified of the change or 'false' otherwise.
	 */
	public boolean notifyStructureChange( String sEventName, Object oSource )
	{
		if ( isdl == null )
		{
			return false;
		}
		StructureChangeEvent scev = ( (EventObjectCache) isdl ).getEventObject( oSource,
				StructureChangeEvent.class );
		scev.setEventName( sEventName );
		isdl.changeStructure( scev );
		return true;
	}

	/**
	 * Returns the locale associated with this runtime context.
	 * 
	 * @return The locale associated with this runtime context.
	 * @deprecated use {@link #getULocale()} instead.
	 */
	public Locale getLocale( )
	{
		return lcl == null ? null : lcl.toLocale( );
	}

	/**
	 * Sets the locale associated with this runtime context. This is usually
	 * done when chart generation begins.
	 * 
	 * @param lcl
	 *            The locale associated with the runtime context.
	 * @deprecated use {@link #setULocale(ULocale)} instead.
	 */
	public void setLocale( Locale lcl )
	{
		this.lcl = ULocale.forLocale( lcl );
	}

	/**
	 * Returns the locale associated with this runtime context.
	 * 
	 * @return The locale associated with this runtime context.
	 * @since 2.1
	 */
	public ULocale getULocale( )
	{
		return lcl;
	}

	/**
	 * Sets the locale associated with this runtime context. This is usually
	 * done when chart generation begins.
	 * 
	 * @param lcl
	 *            The locale associated with the runtime context.
	 * @since 2.1
	 */
	public void setULocale( ULocale lcl )
	{
		this.lcl = lcl;
	}

	/**
	 * Returns if current context is in a right-left platform. e.g. Arabic,
	 * Hebrew.
	 * 
	 * @return
	 */
	public boolean isRightToLeft( )
	{
		// Report direction does no longer depend on Locale, and so the code below is commented out.
		//bidi_acgc deleted start
		/*if ( iRightToLeft == -1 )
		{
			iRightToLeft = ChartUtil.isRightToLeftLocale( lcl ) ? 1 : 0;
		}*/
		//bidi_acgc deleted end
		return iRightToLeft == 1;
	}

	/**
	 * Sets the right-left mode for current context mandatorily.
	 * 
	 * @param value
	 */
	public void setRightToLeft( boolean value )
	{
		iRightToLeft = value ? 1 : 0;
	}

	/**
	 * Returns an instance of the resource handle for which chart specific
	 * messages are externalized.
	 * 
	 * @return An instance of the resource handle for which chart specific
	 *         messages are externalized.
	 */
	public ResourceHandle getResourceHandle( )
	{
		return rh;
	}

	/**
	 * Specifies a resource handle that facilitates retrieval of chart specific
	 * externalized messages.
	 * 
	 * @param rh
	 *            The resource handle.
	 */
	public void setResourceHandle( ResourceHandle rh )
	{
		this.rh = rh;
	}

	/**
	 * Returns an instance of a transient script handler associated with the
	 * chart being generated. The script handler is capable of executing
	 * callback scripts defined in the chart model.
	 * 
	 * @return An instance of the script handler.
	 */
	public ScriptHandler getScriptHandler( )
	{
		return sh;
	}

	/**
	 * Sets an instance of a transient script handler associated with the chart
	 * being generated. The script handler is capable of executing callback
	 * scripts defined in the chart model.
	 * 
	 * @param sh
	 *            An instance of the script handler.
	 */
	public void setScriptHandler( ScriptHandler sh )
	{
		this.sh = sh;
	}

	/**
	 * Returns an instance of a script context associated with the chart being
	 * generated.
	 * 
	 * @return An instance of the script context.
	 */
	public IChartScriptContext getScriptContext( )
	{
		return csc;
	}

	/**
	 * Sets an instance of a chart script context associated with the chart
	 * being generated.
	 * 
	 * @param csc
	 *            An instance of the chart script context.
	 */
	public void setScriptContext( IChartScriptContext csc )
	{
		this.csc = csc;
	}

	/**
	 * Defines an externalized message lookup implementation per chart model
	 * being executed.
	 * 
	 * @param iml
	 *            The externalized message lookup implementation.
	 */
	public void setMessageLookup( IMessageLookup iml )
	{
		this.iml = iml;
	}

	/**
	 * A convenience method provided to lookup externalized messages associated
	 * with a given message key.
	 * 
	 * @param sChartKey
	 *            The key using which an externalized message is being looked
	 *            up.
	 * 
	 * @return The externalized message associated with the specified key.
	 */
	public String externalizedMessage( String sChartKey )
	{
		if ( sChartKey == null )
		{
			return ""; //$NON-NLS-1$
		}
		// The key can be either alone, or with its default value:
		// "key=defaultvalue"

		/*
		 * Possible cases: chartkey lookup badkey nolookup
		 * ------------------------------------- a=b get(a) b b b get(b) b b =b
		 * b - b
		 */
		String sKey = sChartKey;
		String sDefaultValue = sChartKey;
		final int iKeySeparator = sChartKey.indexOf( IExternalizer.KEY_SEPARATOR );

		if ( iKeySeparator != -1 )
		{
			// VALUE ON RHS OF IMessageLookup.KEY_SEPARATOR
			sDefaultValue = sChartKey.substring( iKeySeparator + 1 );

		}

		if ( externalizer == null )
		{
			// no lookup cases
			return sDefaultValue;
		}
		else
		{
			// lookup cases
			if ( iKeySeparator > 0 )
			{
				// a=b case
				sKey = sChartKey.substring( 0, iKeySeparator );
			}
			else if ( iKeySeparator == 0 )
			{
				// =b case
				return sDefaultValue;
			}
			else
			{
				// b case
				sKey = sDefaultValue;
			}
			
			return externalizer.externalizedMessage( sKey,
					sDefaultValue,
					this.getULocale( ) );
		}

	}

	/**
	 * Sets the shared scale
	 * 
	 * @param scale
	 *            shared scale context
	 * @since 2.5
	 */
	public void setSharedScale( SharedScaleContext ssContext )
	{
		this.sharedScale = ssContext;
	}

	/**
	 * Returns the shared scale
	 * 
	 * @return the shared scale context
	 * @since 2.5
	 */
	public SharedScaleContext getSharedScale( )
	{
		return this.sharedScale;
	}

	
	public boolean isSharingQuery( )
	{
		return isSharingQuery;
	}
	
	public void setSharingQuery( boolean isSharingQuery )
	{
		this.isSharingQuery = isSharingQuery;
	}

	// bidi_acgc added begin
	/**
	 * Returns true if current text reading order is Right To Left
	 * 
	 * @return
	 */
	public boolean isRightToLeftText( )
	{
		return iRightToLeftText == 1;
	}

	/**
	 * Sets the bidi text mode of the current chart object .
	 * 
	 * @param value
	 */
	public void setRightToLeftText( boolean value )
	{
		iRightToLeftText = value ? 1 : 0;
	}
	// bidi_acgc added end

	
	/**
	 * @return Returns the resourceFinder.
	 */
	public IResourceFinder getResourceFinder( )
	{
		return resourceFinder;
	}

	/**
	 * @param resourceFinder
	 *            The resourceFinder to set.
	 */
	public void setResourceFinder( IResourceFinder resourceFinder )
	{
		this.resourceFinder = resourceFinder;
	}

	
	/**
	 * @return Returns the externalizer.
	 */
	public IExternalizer getExternalizer( )
	{
		return externalizer;
	}

	/**
	 * @param externalizer
	 *            The externalizer to set.
	 */
	public void setExternalizer( IExternalizer externalizer )
	{
		this.externalizer = externalizer;
	}

	@SuppressWarnings("unchecked")
	public <T> T getState( StateKey<T> key )
	{
		return (T) stateStore.get( key );
	}

	public <T> void putState( StateKey<T> key, T value )
	{
		stateStore.put( key, value );
	}

	/**
	 * Predifined static keys for states.
	 */
	public static class StateKey<T>
	{
		private boolean needClear = true;
		
		private StateKey(boolean needClear )
		{
			this.needClear  = needClear;
		}
		
		/**
		 * Check if the state should be clear itself after chart rendering.
		 * 
		 * @return
		 */
		public boolean needClear() 
		{
			return needClear;
		}
		
		public static <T> StateKey<T> create( boolean needClear  )
		{
			return new StateKey<T>( needClear);
		}

		/**
		 * Key to reference if the data of chart is empty.
		 */
		public final static StateKey<Boolean> DATA_EMPTY_KEY = StateKey.create( false );

		/**
		 * Key to reference LabelLimiter lookup table.
		 */
		public final static StateKey<Map<Label, LabelLimiter>> LABEL_LIMITER_LOOKUP_KEY = StateKey.create( false );

		/**
		 * Key to reference Chart Computation.
		 */
		public final static StateKey<IChartComputation> CHART_COMPUTATION_KEY = StateKey.create( false );
	}

}